6 min · published Jul 10, 2026
Is your AI-built app ready to take payments?
The technical and operational controls that must exist before activating billing in an MVP.
By Leonardo Soledade · product and software consultant
Payment does not end at the button
A working checkout screen is only the beginning. The system must confirm the event on the server, handle repetition, record payment state and grant access even when the user closes the tab before returning.
Webhooks must be idempotent
Providers repeat notifications when they do not receive confirmation. Your endpoint must recognize an event already processed and avoid duplicate charges, credits or emails.
- Verify the webhook signature
- Record the event’s unique identifier
- Respond quickly and process safely
- Have a routine for failed events
The server decides the plan
Price, discount and purchased product should not be accepted blindly from the interface. Read or build that data on the server and associate the purchase with the authenticated user.
Prepare support and reconciliation
Define how to find a charge, issue a refund, correct access and compare the provider with your database. Payments are operations too; without this path, every exception becomes manual investigation.